Just used Delta for probably the third time today, and (as before) I've noticed feeling fairly groggy/spaced out afterwards. Not surprising since Delta is associated with slow-wave sleep and according to wikipedia it can take up to 30mins for cognitive peformance to return, a phenomenon called "sleep inertia". What have your experiences been with Delta? I was thinking perhaps I'd just sit still for 5-10 minutes, and do my daily stretching after, to slowly come back into the world before getting back to work/daily tasks. Thoughts?