One of the sleep myths: nap more than 1 hour human 13:00 or so there is a small peak of melatonin secretion, appropriate nap can reduce human tension. The best nap time for 20 minutes. If more than 1 hour, will produce sleep inertia. Sleep inertia: refers to napping more than 1 hour, waking up dizziness, memory loss, slow action and other phenomena, it takes 15 minutes – 4 hours to disappear. Therefore, sufficient effective sleep is only available at night. Sleep Myth No. 2: Stay up late on weekends to make up for sleep Sleep time is not “bankable” and cannot be withdrawn at will. Therefore, it is useless to use holidays to catch up on sleep.