Question to the ones one here, that also suffer from insomnia occasionally.
How do you manage to pull through the day, with very few or no sleep at all?

Coffee. Lots of coffee and you can pull through the working hours just fine. After that, hope you don't have to have energy for anything

^^ this
Coffee as I wake up
Coffee around 10 to keep me going
Coffee around 3 to prevent snoozing off
Coffee around 8pm to get through the night
Sleep

If I miss that 3pm one I'll crash around 5pm and sleep like a log.

I drink some coffee. Wfh so I can eat quickly and sneak in a 20 minute nap. Sleep away the weekend.

One day is easy with no sleep if it's just office work. If the job involves something potentially dangerous, such as electrical work, you need to quadruple check everything.

I wouldn't drink more coffee than usually because it doesn't have any good effects for me.