Can I use Mind Machines in the morning or in the evening?

You can use the Mind Machines any time you like.

If you want to relax and sleep well, choose from the low frequency sessions like Night Voyage just before going to bed.

If you want to be more active or concentrate, choose something like Accelerate or the sessions meant to sharpen your focus.

Read the included manual that describes what each session is generally geared for and what kind of mood they aim to instill.