It's no surprise that a lack of sleep can cause irritability and changes in mood. You may actually develop a mood disorder if you're consistently sleep deprived. Disruptions in the sleep cycle have been strongly connected to depression and a reduced quality of life. You may also feel more anxious and lose your motivation to do simple everyday tasks. Sleep deprivation may resemble depression or anxiety. Patients report poor mood, irritability, low energy, decreased libido, poor judgment, and other signs of psychological dysfunction. These symptoms usually disappear when normal sleep is restored. If you're sleep deprived, you may have trouble concentrating or paying attention. It may be harder for you to make decisions, remember things, or react. All of these can increase the number of mistakes you make and make you feel restless. No matter how hard you try, you feel fatigued throughout the day. While the purpose of sleep isn't completely understood, studies have shown that sleep energizes the brain. Most people experience an afternoon drop in energy levels, but a little caffeine or rest can help them regain alertness. If you find, however, that you feel like you're dragging throughout the entire day, you may be sleep deprived. Assess your level of fatigue after napping. Did taking naps used to refresh you and now they don't? If you feel like you're always groggy, even after resting, you be dealing with sleep deprivation. Studies have shown that sleep deprivation can lead to weight gain and obesity. This is because your body releases appetite-regulating hormones while you sleep. Sleep is also important for processing glucose faster. Sleep deprivation can disrupt this, contributing to the development of type 2 diabetes. Pay attention to changes in your weight, appetite, and blood pressure. Changes may signal that your body is sleep deficient. Sleep deprivation can also raise your blood pressure, increasing your risk of heart attack. Sleep apnea has also been connected with heart disease. Lack of sleep may contribute to the development of hypertension, coronary artery disease, and heart attack. Consider if you gained weight since the start of the period you've been getting poor sleep. If so, your body may be reacting to sleep loss. If you find yourself frequently canceling plans with friends or family because you're too tired, you may be sleep deprived. While passing on a party isn't unusual, if you find yourself constantly avoiding social events this consequence of sleep deprivation can lead to a poor quality of life. Sleep deprivation and anxiety are closely connected, causing tension in family and social relationships. Your work life may also suffer since sleep deprivation can increase your risk of injury on the job, especially if it requires driving. For example, did you used to enjoy seeing friends and going to events? If you now dread the thought of leaving your house, or it just seems like too much work, you may be sleep deprived. Track important sleep information so that if you need to see a doctor, you can give details about your symptoms. Keep a log of when you sleep, how long of a stretch you slept, the quality of sleep, and whether or not you had trouble falling or staying asleep. You should also note how you felt throughout the day, including your energy level. Note whether your sleep seems to be impacted by outside factors, such as your diet or exercise routine.
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One-sentence summary -- Notice changes in your behavior. Consider your energy levels throughout the day. Look for changes in your health. Consider your social life. Keep a sleep log.

Q: Scientists understand the Celsius scale as derived from the Kelvin scale. Though the gaps between Celsius and Kelvin are even larger than the gaps between Celsius and Fahrenheit, one thing that Celsius and Kelvin have in common is that they rise at the same rate. Whereas the ratio for Celsius to Fahrenheit is 1:1.8, the ratio for Celsius to Kelvin is 1:1. If it seems odd that freezing for Kelvin would be such a high number 273.15 it's because the Kelvin scale is based around absolute zero, which is 0K. Though 0C is the freezing temperature of water, scientists actually understand 0C as 273.15K. Since the two scales rise at the same rate, then converting Celsius to Kelvin always means simply adding 273.15. For example, if you're working with the temperature 30C, just add 273.15 to that. 30 + 273.15 = 303.15K. Here's a rough scale so you can test whether your answer makes sense. Note that the Celsius and Kelvin scales increase at the same rate, so the two numbers are always exactly 273.15 apart. If you start with an integer value of degrees Celsius, your result in kelvins will end in the decimal .15. The lowest possible temperature is -273.15C = 0 kelvins. If your result involves negative kelvins, you either made a math mistake or the problem uses impossible values. Celsius kelvins -100 173.15 -50 223.15 0 273.15 50 323.15 100 373.15 200 473.15 500 773.15
A: Understand the scales. Add 273.15 to your Celsius temperature. Check your answer.

Article: Your dermatologist will examine your skin spots to find out what's causing them. Then, they'll tell you the best way to treat them. This can help you choose a safe, effective treatment. Visit your dermatologist to get your skin checked. Ask your doctor for a referral to see a dermatologist. Typically, these products contain hydroquinone, which prevents your skin from making melanin. Use your cream for several months before you expect to see results. Make sure you follow your doctor's instructions exactly for applying the cream. You'll likely notice your dark spots fading slowly over time. During this procedure, your dermatologist will deeply exfoliate your skin to remove the damaged layer of skin. This can reveal younger, more even skin, which helps get rid of dark spots or acne scars. If your dermatologist recommends microdermabrasion, expect to get treatments every 2 weeks over a 16-week period. This procedure may cause skin redness or flaky skin. If your spots are really dark, they may not completely go away. However, they will likely get lighter. Your dermatologist can apply trichloroacetic acid or phenol to your skin to peel away the top layer of your skin. This will remove damaged skin cells and reveal smoother, fresher skin. Talk to your dermatologist to find out if a chemical peel might help fade your spots. Expect it to take 14-21 days for your skin to heal after a deep chemical peel. During this time, you'll need to apply an ointment to your skin to help it heal without scarring. Your skin will be very sensitive after a chemical peel, so you'll need to avoid makeup and the sun. Additionally, you might experience redness, burning, and itching. A laser treatment uses heat to regenerate your skin, which can fade your brown spots or acne scars in 1 or 2 treatments. Similarly, laser treatments can fade your freckles over the course of several treatments. Talk to your doctor to find out if laser treatments might get rid of your spots. Laser treatments do carry some side effects. They may cause your spots to temporarily crust or darken, but this effect will go away. Laser treatments typically don't work well on dark skin or tanned skin. Your dermatologist can use liquid nitrogen to freeze the skin cells that are causing your dark spots. As your damaged skin cells heal, they'll lighten, which fades your spots. This procedure can be a bit painful, but it provides quick results. Ask your dermatologist if it may be right for you. You might have temporary pain, swelling, redness, and blistering after getting this procedure. However, these side effects should heal.
Question: What is a summary of what this article is about?
See your dermatologist to learn about the best treatment options. Ask your dermatologist about prescription skin lightening creams. Try microdermabrasion to help remove age spots or acne scars. Get a deep chemical peel to get rid of dark spots, freckles, or acne scars. Ask about laser treatment for brown spots, freckles, and acne scars. Try cryotherapy to quickly freeze and fade dark spots.