Hi Frankie!
The choice whether to get out of bed and do something when you can’t sleep is really up to you. A good guideline is what did you do, when you couldn’t sleep BEFORE you have insomnia? There must have been many instances you encountered sleepless bouts in the past. Just do now what you did then, your body’s ability to sleep hasn’t changed, it’s your thoughts and ideas about sleep that have.
Imagine another scenario like this: how did you learn to walk? As a baby, did you constantly obsess about it and was anxious about making progress? Certainly, no. You learnt without any intention or meeting deadlines or constantly proving to yourself you could walk, you slowly became better at it and before you knew it, you were already walking steadily and gracefully. Well sleep is exactly like that. Achievement without intention or effort. Ask yourself: what are you trying to prove to your body when you are getting out of bed when you can’t sleep? That you CAN sleep?? So then every night becomes a relentless endeavour to prove to your mind that you can sleep and this is why this is such a struggle! Because you can’t win every time and when you don’t, you get frustrated, sad and scared that something is wrong and you need to do something about it. The lesson here is: STOP PROVING TO YOURSELF YOU CAN SLEEP, BECAUSE SLEEP IS COMPLETELY NATURAL AND EFFORTLESS, JUST LIKE BREATHING OR WALKING. You don’t keep walking just to prove to yourself you can walk in the same way you don’t need to constantly get out of bed to prove your body can sleep. Good luck.