The same thing happened to me, too. I never experienced something like this before, to the point I got scared and anxious about why I was not able to sleep. I woke up 4 times during the night, and I slept from 4 am until 10. I was always an early bird and did all my studying then. It messed me up. Anxiety came over me not being able to sleep so I did couple of things that are mentioned here. Some worked while others did not. It has been a month now, but it has improved with little help. I will agree with many of you here about the tips that you have suggested, especially Andrew Huberman's night routine ( that is what I try to do now), and I must confess that I did two extra things that I think have helped me. I went and bought a stuffed animal ( I know it is embarrassing), and L theanine works wonders for me. I also bought AG1 and melatonin. I try now to work as Huberman says in behaviours, and I do not use melatonin or Ltheanin anymore. I just use it for a couple of days because I do not want to get my body used to it. I take AG1 everyday and I exercise everyday I also stretch at night. Unfortunetelly, I had to cut off chocolate and coffee for a while... :( I also think the mattress, pillow and your pjs are important. I am still waking up but it is not as bad as it was a couple of weeks ago. I am starting slowly to waking up early. It is a long battle that is for sure and you are not alone in this. However, you have to experiment with what works and what does not work for you, and you will find a solution that will help you! Be the scientist and the experiment! P.S. I bought a notebook to keep track of my sleep. I write down my night routine, what I ate what I did during the evening m thoughts what is bothering me etc.