Currently, I'm beginning to think my routine is causing my sleep schedule issues.I tried early mornings(like 6am, which isn't early for some but early for me) and I hated it even tho I did it for a while...
Hydration was always an issue first thing in the AM for me which effected the amount of weight I could lift. Always was consistently less than it I was properly hydrated and lifting in the evening.
There is some science that shows the best time to lift based on your hormonal cycles that ebb and flow throughout the day would be late afternoon or early evening...like anywhere in the 3-7pm range.
Working out too late in the evening used to cause sleep problems.for me and apparently is a common issue so that is something else to keep in mind if you are working out intensely...
But the most important thing overall is that you do it at some point in the day versus the time you do it at, so whatever ends up being the most convenient way that will allow you to stick with it is what you should do.
I have an uncommon work/life schedule and I can only get a session in typically after 9:30-10pm and finish around 11/11:30 or so. And even though I am 'tired' afterwards my mental energy levels shoot up shortly thereafter and I use the late evening to be productive. There are things I need to get done after lifting like studying and practice, but if i'm really gassed physically that is a challenge and that time spent isn't of quality. Days were I am doing legs I will literally sleep for 10-12 hours and wake up at noon and be fairly unproductive that day which is no bueno. I've been super consistent and haven't missed a scheduled workout in 7 months, but my schedule keeps pushing further and further back.
Since making this post i've been slamming my pre-workout meal and shake as I commute home from work at about 7:30. After spending 45 minutes in **** conditions and traffic I have a pretty big boost in 'energy'. I know angry lifting is frowned upon, but I use that as fuel. This has been working better for me so far and puts me in a more relaxed state afterwards. I'm going to keep experimenting and will probably try mornings once it starts warming up a bit since my garage is like 7 degrees in the morning.