Sleep Management
Difficulty sleeping and excessive daytime sleepiness are opposite problems, not two versions of the same one: this group includes a medicine for getting to sleep and medicines for staying awake during the day. Which one is relevant depends on the underlying condition a person has.
Key points
- NHS describes insomnia as persistent difficulty sleeping that affects daytime life, usually addressed first through changes to sleep habits.
- NHS notes that narcolepsy can involve excessive daytime sleepiness and may be managed with wakefulness medicines.
- Sedating antihistamines are sometimes discussed alongside sleep, though that is not every such medicine’s own listed use.
Melatonin and the timing of sleep
Meloset contains melatonin and is used for circadian rhythm sleep disorders, where a person’s internal body clock is out of step with day and night. It is the only medicine here that acts on sleep timing itself, rather than on wakefulness or an unrelated condition. NHS guidance on Insomnia covers ongoing difficulty getting to sleep.
Modafinil and armodafinil for staying awake in the day
Two of the four medicines here work in the opposite direction, keeping a person awake rather than helping them sleep. Modalert’s active ingredient is modafinil, and Artvigil’s is armodafinil. NHS’s Narcolepsy - Treatment page covers wakefulness medicines used for narcolepsy, obstructive sleep apnoea and shift work sleep disorder.
Phenergan treats allergy and nausea, not insomnia
Phenergan contains promethazine and is used for allergic conditions, motion sickness and nausea and vomiting, not for insomnia. Sedating antihistamines are sometimes discussed in a sleep context, but this particular medicine’s own uses do not include a sleep disorder.