Sleepy?

If one does not sleep enough you feel tired and as your brain just does not want to work properly. Missing out enough sleep can that lead to a from a waking sleep were everything in your environment seems very surreal. That is called insomnia it is a state which today probably more common then is good and a new study suggests that missing sleep is not just problematic for the body because it reduces the time alloted for regeneration but also because the production of new Brain cells seems to be reduced. Now this would manifest in the study after 72 hours of sleep deprivation and there is no study right now dealing with the effects of little sleep loss such as often is experienced by students and the working population. Yet, it does once more show that sleep is very important for our body and mind.

No sleep means no new brain cells (BBC)