Darryl,
the correct translation would be 'Kya ker rahe ho? Ab khade ho ker, sone jao.'.

Best wishes in your efforts to learn Hindi.
Regards
Roomy F Naqvy

'wass up' can be translated many ways:
'kya ho raha hai?'
'kya haal hai?'
'kya chal raha hai'

go and sleep :

go is "jaao"
and is "aur"
sleep is "sona" but here it will be translated as "so jaao" emphasising the action.

if you just want to say "go sleep" you can say "sone jaao."

I have no idea how Naqvi sahib got the "Stand up" in his answer.

kya baat hai:wasss up
jakar so jao:go and sleep