Key Findings at a Glance

Nicotine delays sleep onset by 10–30 minutes and reduces total sleep time, with evening use having the strongest effect HIGH CONFIDENCE
REM sleep is suppressed by 15–30% in nicotine users, affecting dreaming, memory consolidation, and emotional regulation HIGH CONFIDENCE
Evening vapers have 2–3x higher insomnia risk compared to non-users or morning-only vapers MODERATE CONFIDENCE
Sleep gets worse before it gets better after quitting — 1–3 weeks of withdrawal insomnia, then gradual improvement over 3–6 months MODERATE CONFIDENCE
Nicotine-free vapes have minimal sleep impact for most people, though PG/VG vapor may cause mild throat irritation in sensitive individuals LOW CONFIDENCE

Nicotine delays sleep onset by 10–30 minutes and reduces total sleep time, with evening use having the strongest effect HIGH CONFIDENCE
REM sleep is suppressed by 15–30% in nicotine users, affecting dreaming, memory consolidation, and emotional regulation HIGH CONFIDENCE
Evening vapers have 2–3x higher insomnia risk compared to non-users or morning-only vapers MODERATE CONFIDENCE
Sleep gets worse before it gets better after quitting — 1–3 weeks of withdrawal insomnia, then gradual improvement over 3–6 months MODERATE CONFIDENCE
Nicotine-free vapes have minimal sleep impact for most people, though PG/VG vapor may cause mild throat irritation in sensitive individuals LOW CONFIDENCE

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