1:37 What are the risks of messing with these states? For example, meditating at midday might make it feel like I had a sleep making my body think that it's 05:30am, ready for the day, when it is in fact 1pm?
Nah. As long as you stay awake, meditation doesn't really affect the "sleep pressure" going on inside your brain. If you do fall asleep, a long nap at midday shouldn't sabotage your night-time sleep either. Only after 4 PM.
Jaco Van Der Merwe