Keep the bedroom temperature moderate. An excessively warm room disturbs sleep. There is no evidence that an excessively cool room improves sleep. Avoid excessive liquids in the evening to prevent awakening to urinate. Avoid alcohol in the evening.
Alcohol helps tense people fall asleep easier, but the sleep following is more fragmented.
Chronic use of tobacco disturbs sleep and should be avoided. If you find yourself waking to look at the clock, face it away from you. If you feel angry or frustrated because you cannot sleep, do not try harder to fall asleep. Instead, leave the bedroom and read a book or magazine. Do not do any stimulating activity.