I would suggest kneeling and placing your weight on your toes (curled underneath, heels touching one another with butt resting on them, think Japanese praying in front shrine) this puts a lot of weight on your pelvic floor and strengthens the lower back and spine which gets out of whack from sitting long periods. Do it barefoot, shoes are cheating. Sleeping on your back will naturally keep you more awake , don’t fight it !