Hey guys Bart is here to explain! The joke here is that a lot of times while we're sleeping, we suddenly get this intuition that we're falling off from some height and we instantly wake up to realise that it was nothing but just our brain f**king up with itself to wake us up in the middle of the night and then we're left as it is in our bed not able to sleep for some time, which is very frustrating but kinda funny too for how our brain plays with us. The meme shows this with 3 slides, the first one showing us sleeping, the second one of our brain suddenly making us feel we're falling and waking us, and the third one of us realising it was nothing and us just left with our eyes open and heart beating faster than Eminem could ever rap.
And if you’ve read this far, you might as well follow! I explain memes like this all the time :) @BartExplains