In my lifestyle plans on live. plans I recommend that you journal and plan your day.
But I do give you the option to do this before or after you sleep... why?
Undertaking this in the morning can be a great way to ease into the day and get your mind right, but not everyone has time for an extensive morning routine.
Doing this practice before you sleep allows you to wake up and immediately start the day, knowing exactly what you need to do.
You can also free up time, and reduce some of the friction, in the morning by preparing what you can the night before.
This may be prepping your food for the day, laying out your clothes for work, the gym, or a run, and/or whatever else it might be that you would otherwise need to do in the morning.
This may sound very simple, but it's extremely powerful.
I've personally found a clear link between starting the day the night before and the amount that I can achieve in a day.
At night you also have far fewer time constraints with no "race" to get out the door or started with your day.
It all comes down to you and your life situation... in fact, I often change depending on my life situation - so give both a try and see what works for you.