Vitamodo School · Bundle 3: Sleep as Symptom · Brochure 3 of 10 · Version 1.0
Andris Saulitis, MD
For those who: are taking prescribed medication for any condition, have noticed their sleep changing, and want to know whether what is in the bottle is part of the picture.
Not for those who: are looking for permission to stop a prescribed medication on their own. Decisions about prescribed drugs always belong with the prescribing clinician.
What this is — the clinical reality
Insomnia can be produced by the medication taken for something else. This is one of the most common clinical situations and one of the most consistently missed. The patient does not connect the new prescription to the new sleep problem. The prescriber, focused on the condition being treated, does not always ask. The sleep is treated as a separate complaint while the cause continues to be taken nightly.
Three systems carry the change.
The first system is the direct pharmacological action on sleep. Some medications affect the neurotransmitters, receptors, and circuits that govern sleep onset, sleep maintenance, or sleep architecture. Beta-blockers cross the blood-brain barrier and reduce melatonin release; corticosteroids produce HPA-axis activation that mimics the morning waking state; SSRIs alter REM sleep; ADHD stimulants taken after midday delay sleep onset by hours. Each of these is acting directly on the sleep system, predictably, in a way that the prescriber may or may not have mentioned.
The second system is the indirect effect through other organs. Diuretics produce nighttime urination that fragments sleep. Bronchodilators and other sympathomimetics produce sympathetic activation that mimics anxiety. Antihistamines designed to cause sleepiness paradoxically produce arousal in some people, particularly children and older adults. Thyroid hormone replacement, when overdosed, produces a hyperthyroid state that includes insomnia. The sleep is being disrupted not by direct action on the sleep system but by what the medication is doing to another system that then talks to the sleep system.
The third system is polypharmacy interaction. Each new medication is generally considered against the conditions it treats. The combined effect of three, five, eight medications on the sleep system is, in clinical practice, rarely modelled. Two medications that each cause mild sleep disturbance can together cause severe sleep disturbance, with no individual prescriber having predicted it. The older adult population is most exposed to this pattern. The medication list, viewed as a whole, is itself a clinical object.