I have to stop drinking coffee by 2PM. Actually, I just drink tea at the moment, but also have my last cup at 2PM. After that I drink water or juice.
Sleep music has really helped me.
I sometimes realise I am hypomanic when I can't get to sleep. I need min 8 hours sleep, else I battle. Weekends are worse for me, even though I can obviously sleep in more. I tend to nap on weekends.
Maybe try a different sleep aid? Zopiclone helps me.
Keep checking in with your T, and make note of any other symptoms you may experience