I wonder if christians realize what happens when you die. [Spirituality & Religion]

I know for a lot of christians the idea is that you shuffle off this mortal coil and start partying hard in HEAVAAAAN!😎
I think that's what most people think when they think about it at all.
But what is the biblical support for that idea? As far as i know, when you die you go to sleep. And you stay asleep until christ returns. And THEN you gut up into heaven.