Some people report that they cannot go to sleep, while others need extra sleep. Much of this is going to depend on your habits and how you are coping with quitting smoking. If you are having trouble sleeping, it could be the extra energy you have after quitting or even something as simple as having too much caffeine. Nicotine causes the metabolism of caffeine to double in rate, effectively making it so you’ll need half the caffeine as you did when you smoked to achieve the same effect. If you are having trouble sleeping, try reducing your caffeine intake since you may be getting too much. Also try exercising or waking up earlier if you are still having trouble. Remember that you’ll be adjusting to quite a few things as a non smoker so bear with it and change your lifestyle accordingly.