Chronic Sleep Deprivation. This is a medical condition.
it's much more likely that the lack of sleep itself is not the cause of the suicidal thoughts, but is another symptom of depression. But, yes, lack of sleep can cause one to feel meh, and possibly simulate depression.
be without
sleep
A word beginning with R for sleep is rest.
Lack, want,
lethargic
lack dearth
incommunicado
Inaction??
sleep place
somnambulism