Your room should be quiet and sufficiently dark, because darkness prompts the pineal gland to produce melatonin, the hormone that regulates circadian rhythms (your 24-hour body clock).

• 你的卧室应该很安静，而且要足够的黑，因为黑暗能刺激你的松果腺分泌出降黑素，这种激素是来管理你的24小时生理节奏的（就是你的生物钟）。(加菲猫