The very worst thing you can do is shoot when you are tired.
Thats when bad habbits set in and they are had to get rid of.
Best thing to do is put the bow up for a couple of days then re group.
When you do go and practice have a plan and work on one thing at a time ie grip today, tomorrow work on your release make sure you use your back muscles to fire the release dont shoot it like a gun trigger, another day work on aiming, come to full draw aim, hold for 20 seconds then let down do this your whole practice session.
You can also start off each session blank bailing, come to full draw anchor make sure the bow is pointed at your target then close your eyes and release using back muscles.
There are a ton of things you can do at practice sessions the thing is make your practice quality practice and not quantity (sp) just flinging arrows is not proper practice