The sleep-wake cycle is a 24 hours biological pattern of sleep and wakefulness in humans. It usually comprises seven to eight hours of sleep during the night and 16 hours of wakefulness in the daytime. It is controlled by the brain stem by communication with the hypothalamus. The body uses the circadian rhythm to control the sleep-wake cycle. The melatonin hormone secreted in the dark plays a major role in the regulation of the sleep-wake cycle. An irregular sleep-wake cycle causes insomnia and morning sleepiness. Increased exposure to blue light at night causes disturbance in the sleep-wake cycle.
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Why do a lot of thoughts prevent me from falling asleep?
Query: Hi doctor, I cannot sleep early at night and cannot wake up early in the morning. I normally sleep at around 2 AM and wake up at 10 AM in the morning. I am also very tensed when I try to sleep, lots of thoughts come to my mind regarding my life, my past, and my future. I think unnecessary things. ... Read Full »
Answer: Hello, Welcome to icliniq.com. I completely understand that you are concerned about your sleep timing and have difficulty in initiating sleep due to excessive thoughts. Sleep problem may be due to stress or tension. Since childhood, you have been sleeping late at night, so it might have become your... Read Full »