Writer's block is a real problem and all writers will feel it. I find that if i do something else in that moment, and return to writing say a few hours later, then I am fine and continue writing. Its my brain saying hang on, you need to rest from all these words, otherwise you going to write without passion. Another way i defeat writers block is to free write without punctuation or grammar which i call streaming.

just walk away, physically and mentally, from the whole thing. Go about your daily stuff and you'll somehow get stimulated by external stuff. You'll see a car that drives by with an engaging sign on it then boom --> idea is yours.

I rewrite other people's writing like my favourite author's obscure work for eg. It's like rephrasing the same sentences in your own way. It helps me concentrate. Also I do lots of reading and listening to music. Don't try to force the words out, that never works out right. Try to get your serenity of mind back and for that do whatever that works for you. Sleep is a good option, as you have found out first hand. Oh! Sex does wonders for an overworked brain. Endorphines relax your nerves. So you are, as the Chinese put it, renewed in the coupling. Hugs and chocolates.