Evening, that's what is usually recommended unless you get the insomnia. Around 9-10pm is the usual recommended time so that it gets the most effect in the early hours of the morning, when endorphin production is highest. I take mine at around 8pm as I'm trying to see if that brings my "good period" a little earlier rather than from 9pm-11pm.
Just try not to stress over insomnia or if you're staying awake a little longer than usual - I now stay awake later, but fall asleep easily once I start to get sleepy. I thought worrying over insomnia at first would increase the likelihood of me getting it, but I still didn't
Only on 0.5mg though, which is lower than usual.