In reply to Cake:
You're already aware of exercise-induced insomnia, so this may be a self-answering query. But we've all been there as parents, and it's not like you have a lot of choice with littlies.
You're probably pushing cortisol and ACTH levels around, and an hour to get these under control is optimistic - you may simply need more time.
Exercise tends to raise core temperature, which can have a short term effect on sleep latency (measure of the time it takes to drop off). Obviously, you don't want to go rolling in the snow (fat chance), but some kind of controlled cooling down might help.
Some people find antihistamines help, but it's a drug intervention and may affect sleep quality.
Both lettuce and valerian have been shown to have modest effects on sleep latency.
But for me, the number one sleep inducer is to watch ASMR vids on YouTube (aka the whisperers). Weird as f###, but it doesn't half work. Just explain it to your wife first, or she'll think it's some kind of porn.....
Martin