We have developed a lot of habits, such as, eating habit, study habit, reading habit, etc. However, taking the time to develop a sleep habit is probably the last thing on your mind and some sleep （1）a______ simply can't be forgotten. Here are some bad habits you need to give up.
  Watching TV until you fall asleep
  It has （2）n______to do with what you watch-it's the TV's light. The light keeps you awake all the night.
  Sleeping with pets
  Pets sleep most of the day, and they move a lot when sleeping. They get comfortable, and then they move. This goes on all night, and it often makes you not sleep well.
Eating fatty, heavy foods too close to bedtime
If you've tried to go to sleep （3）a______ eating a fatty meal, you've probably found the discomfort of your stomach stopping you from falling asleep or staying asleep.
Exercising （4）h______ too closed to bedtime
Heavy exercise too close to bedtime （5）r______ your body temperature so that your sleep is disturbed（不安的） until your body temperature drops to normal（正常）， which may take several hours.
Accepting snoring （打呼噜） as normal sleep behavior
  Snoring is the （6）b______ sleep killer. Maybe it's caused by sleeping on your back, being overweight, having a cold, drinking, or taking drugs. Most seriously, it's caused by a dangerous illness. For the snorer, it disturbs sleep by awakening him/her every so often in order to breathe normally.