Sleep benefit is a common phenomenon of variable duration ranging from 30 minutes to 3 hours in PD and implies improvement in mobility and motor state in the morning and after drug intake at night (98). The mechanism of sleep benefit is unknown, and possible causes include (i) recovery of dopaminergic function and storage during sleep, (ii) a circadian rhythm-related phenomenon, or (iii) a pharmacological response to dopaminergic drugs (7,30). Good sleep hygiene is also useful. Activities such as a hot bath a couple of hours before bedtime, maximizing daytime activity, ensuring bright light exposure, having a hot sweet drink or a light snack at bedtime, use of handrails in bed and/or satin sheets to enable easier turning in bed, flexible bed times, a reclining armchair for some, and avoiding stimulants such as tea or coffee at bedtime are part of good sleep hygiene (81). Nocturia remains one of the most common causes of sleep disruption in PD and can be reduced by avoiding diuretics, tea, or coffee at bedtime. The use of desmopressin nasal spray may also be helpful in some patients (64). Some have suggested the use of combined D2-D1 receptor dopamine agonists such as pergolide, but this has not been established in clinical trials (82). In cases with risk of urinary incontinence, condom catheters or a bedside urinal are essential to ensure a good quality sleep with minimal interruption.
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