What is 'poor sleep hygiene'?

Sleep Hygiene: Poor sleep hygiene includes exercising right before bed, reading and watching tv in bed, not following a sleep schedule (set wake time and sleep time), drinking alcohol before bed, laying in bed awake for greater than 10 minutes, going to bed anxious. These are just a few "bad habits" that contribute to poor sleep hygiene.

The opposite of this: Sleep hygiene (going to sleep regularly at the same time, no lights or noises, avoid certain meals, not doing other things -like reading/watching tv- in bed, etc.).

Things like -: going to bed with the radio or TV on. Going to bed & getting up at varied times (lack of consistency). Eating large meals before bed. Lack of regular excericse - or engaging in strenous activity right before you go to bed. Drinking lots of alcohol. Caffiene use late during day. Having lights on when you are trying to sleep. Checking your alarm clock over and over. Etc.