Would it be possible to get deep vein thrombosis during sleep?
It may be possible, but not likely, assuming you’re not sleeping sitting up or in a tight space. When you’re lying down, the effect of gravity pulling blood into your legs is reduced, so that the circulation will be better. Assuming you’re in a relaxed position so that your legs aren’t tightly bent and the veins aren’t being constricted, the major culprits in DVT have been reduced.