Poor sleep could result from various factors such as poor sleep environment or poor sleep hygiene. It can also happen when your circadian rhythm tells you to stay awake while you are trying to sleep. You might experience this when you travel across time zones, work on night shifts, or simply having a misalignment of circadian rhythm with your sleep schedules. Due to the nature of sleep, it’s not easy to pinpoint specific causes of poor sleep. You should consult a sleep doctor for more information if poor sleep persists.