MacBook Air wont turn on

I am having this repeated problem with my MacBook where it just won’t turn on after I’ve used it or whilst I’m using and it is inactive for a few minutes. Despite my laptop being fully charged it will not turn on. I have long pressed the power button, tried holding the Control, Command and power button but nothing seems to work. Sometimes I will have to have my laptop connected to a powder source for 30 minutes unplug it and then turn it on. So last night I left it on charge all night and this morning the black screen is still showing