| nocturnal enuresis | Urinary incontinence during sleep. Synonym: bed-wetting. (05 Mar 2000) |
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| nocturnal epilepsy | An epilepsy syndrome characterised by nocturnal seizures only. (05 Mar 2000) |
| nocturnal myoclonus | Frequently repeated muscular jerks occurring at the moment of dropping off to sleep. (05 Mar 2000) |
| nocturnal periodicity | A circadian rhythm with the periodicity expressed during nighttime hours, as in the night release of microfilariae of the human filaria Wuchereria bancrofti into the peripheral blood; this type of periodicity is found in regions where the vector mosquito is a night-biting species. (05 Mar 2000) |
| nocturnal vertigo | A feeling of falling when dropping off to sleep. (05 Mar 2000) |