I was wired on T at first. Not sure if it was just the happiness of finally starting or something hormonal. It died down after several months, but I still do have more energy/endurance compared to pre-T.
As far as the sleeping, though: my sleeping patterns went right back to how they were when I was a teenager. I was a horrible pseudo-insomniac as a teenager and couldn't fall asleep before midnight, no matter how tired I was; when I did get to sleep, it was a deep sleep that lasted 10+ straight hours. When I got to my 20's, 8 hours was sufficient and an 11pm-7am schedule worked well for several years.
After T, I soon found myself needing 10 hours of sleep again to not feel tired all the time, but I couldn't fall asleep before midnight no matter how much I (physically & mentally) tired myself out during the day. Thankfully, my sleep habits are slowly shifting back to the 8 hour, asleep by midnight schedule.