how many stages of sleep is there
There are 4 stages to NREM sleep that need to occur before REM sleep begins. (The following stages are found in the Quick Series Guide to Healthy Sleep) STAGE 1: Light sleep, lasts about 10 minutes. During this time, you feel calm and experience sudden arm and leg movement. Your heart rate lowers and the eyes open without awareness. If you are awakened you feel in a state of âhalf-sleepâ. STAGE 2: Begins a sleep that lasts about 30 â 45 minutes. During this time there is lack of movement, you become oblivious to your surroundings. If you wake up during this time, you do not remember your dreams. STAGE 3: Brief time before Stage 4.