Another question. I have training contractions and muscle tension. But…

Another question. I have training contractions and muscle tension. But when I go to sleep, the baby starts moving actively. Pinching, wriggling non-stop. I can't sleep. I think something is wrong, maybe he lacks oxygen or space because he's already three months old and quite big. Ultrasound I don't know what to do or not. He was lying transversely. Maybe it's inconvenient because of how I lie?