Avoid nicotine (e.g. cigarettes, tobacco products). Used close to bedtime, it can lead to poor sleep. Nicotine is also a stimulant. Smoking before bed makes it more difficult to fall asleep. When smokers go to sleep, they experience withdrawal symptoms from nicotine, which also cause sleep problems. Nicotine can cause difficulty falling asleep, problems waking in the morning, and may also cause nightmares. Difficulty sleeping is just one more reason to quit smoking. And never smoke in bed or when sleepy!