well a person that can't sleep has insomnia.
Chloroform or Ether. ========================== Soporific Anesthetic
scientest
a symbologist
On the phone.
A vulcanologist.
you call them a tired person =-=-= or you could call them asleep
A person who finds it hard to sleep is called an insomniac.
A person who loves to sleep or a person who has an obsession with bed rest is called a "CLINOMANIAC."
When someone disturbs a person while they are sleeping and shows no regard for their rest, it can be referred to as sleep disruption or sleep disturbance. If the behavior is intentional and inconsiderate, it may also be described as being inconsiderate or disrespectful. In extreme cases, such behavior could be characterized as harassment.
An insomniac
A common term would be sleep walker.
modest
they may be tired
a dolley is someone that doesnt work.
When you can't sleep you might have insomnia so a person who can't sleep might be called an insomniac.
In the UK - we call them an 'out-patient'.
An atheist, or sometimes a secular humanist.