I'd like to add something: if he is cycling more, it would be very worthwhile to start keeping track of his moods. That will help in establishing if the "swings" are happening.
Here are three resources: the first are computer programs for tracking moods:
They are both popular; Moodtracker is perhaps more well known, at least here in the US. Here, though, is a simple printout with charts that you can copy and fill in by hand and that may be enough:
I wish you the very best!
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