Nicotine may cause:

Nicotine may cause:

• A. Insomnia
• B. Sleep apnea
• C. REM behavior disorder
• D. Daytime sleepiness

Answer: (A)

Nicotine acts as a stimulant in the brain, increasing arousal and wakefulness by activating nicotinic acetylcholine receptors and boosting neurotransmitters like norepinephrine. When nicotine is used near bedtime, this heightened arousal makes it harder to fall asleep and to stay asleep, leading to insomnia. Withdrawal during the night can cause awakenings and further disrupt sleep continuity, reinforcing the insomnia pattern. Because sleep disruption is the direct effect, daytime sleepiness can occur as a consequence, but the primary sleep-related issue linked to nicotine exposure is difficulty initiating and maintaining sleep. Sleep apnea and REM behavior disorder are not typical direct effects of nicotine use.

Nicotine acts as a stimulant in the brain, increasing arousal and wakefulness by activating nicotinic acetylcholine receptors and boosting neurotransmitters like norepinephrine. When nicotine is used near bedtime, this heightened arousal makes it harder to fall asleep and to stay asleep, leading to insomnia. Withdrawal during the night can cause awakenings and further disrupt sleep continuity, reinforcing the insomnia pattern. Because sleep disruption is the direct effect, daytime sleepiness can occur as a consequence, but the primary sleep-related issue linked to nicotine exposure is difficulty initiating and maintaining sleep. Sleep apnea and REM behavior disorder are not typical direct effects of nicotine use.