The Pathway. 1  Air enters the nostrils. 2  passes through the nasopharynx, 3  the oral pharynx.  through the 1  glottis. into the trachea.  into the right and left bronchi, which branches and rebranches 1  into. bronchioles, each of which terminates in a cluster  of. alveoli.
As the body adjusts to less caffeine, these symptoms should subside. Nicotine May Cause Less Sleep. Nicotine is also a stimulant, and nicotine side effects can cause insomnia and withdrawal symptoms similar to caffeine. Smoking may also create other sleep disturbances.
People with depression often awaken in the early hours of the morning and find themselves unable to get back to sleep. Avoid caffeine, nicotine and alcohol: Caffeine, a stimulant, is found in coffee, chocolate, some soft drinks, nonherbal teas, diet drugs and some pain relievers. Smoking disrupts deep sleep cycles and can prompt nicotine withdrawal when you first wake up. Avoid alcohol before going to bed at night. Avoid daytime sleep if possible. Daytime naps steal hours from nighttime slumber. Avoid staying in bed for long periods of time while awake, or going to bed because of boredom. Relax by reading, taking a bath, or listening to soothing music before getting to bed.