They are only for extreme sleep issues, such as paradoxical alertness after more than 36 hours on my feet.
From the guardian.co.uk
The strategies include attention to sleep hygiene, stimulus control, behavioral interventions, sleep-restriction therapy, paradoxical intention, patient education and relaxation therapy.
From the en.wikipedia.org
Paradoxical as it seems, studies are showing that more sleep is a dieter's ally, while burning the midnight oil may sabotage weight loss goals.