Thanks for sharing those insights @therovingreader! I am quite familiar with hyperfocus... but I have to "break through the wall" to get there.

The easiest place tends to be with my artwork... which can be quite meditative and hypnotic, especially if I put on the right kind of music (listen to a lot of melodic progressive house and trance), it only takes me about 30-40 minutes to get "there."

With other stuff-- be it paperwork or working on my eBay store or something like that... I break through the "I wanna sleep" barrier in about two hours... after which I can stay "in the zone" for 12 hours straight, without a break... it scares people how much I can get done. Once, under considerable time pressure, I cranked out an 80-page business plan in about 14 hours. My manager at the time just looked at me and said "That normally takes three people a WEEK to do..."