Really need help on sleeping its important i babysit a 3week old baby in mornings?

alright yall i just cannot sleep its 4:40am at the time of this typing an im WIDE awake + as soon as i lay down an this has been happenin for FOREVER but as soon as i lay down my nose gets stuffed up an i got no medicine for that or sleep how can i MAKE myself sleep an stop having stuffy noses when laying down i mean im up atm an on the comp an nose is fine but when i lay down its so damn stuffy its stupid lol i need some help how can i MAKE myself go to sleep an stop a stuffy nose i babysit a 3 week old baby in the mornings the sleepless nights kill me when watchin him