Hi there. Strange question. I have heard the TR-gang discuss how doing an intense workout in the evening can have a negative impact on sleep. In my experience, I have a much harder time sleeping if I do my workout outside.
For example, last Sunday I did Juneau -1 outside. It ended up being 2hrs 20mins with TSS of 159 and IF of 0.82. I finished the ride around 5:00 PM and went to bed around 10:00 PM. I could not fall asleep until about 3:00 AM. This is just one example - this happened to me almost every time I rode outside in the afternoon with some intensity last summer.
On the other hand, I did a tough VO2 Max workout on Tuesday night (Bashful +6) and a tough Threshold workout (Avalanche Spire +1) yesterday. Both were inside, starting around 6:00 or 6:30 PM and finishing around 8:00 PM. Again, I went to bed around 10:00 PM and had no issue falling asleep. And I did both workouts in a hotel room with inadequate cooling.
Has anyone else experienced this? Is there any reason why outdoor workout would have more of an impact on sleep quality? Is there an extra rush of adrenaline from riding outdoors? Ultimately, I think the solution is simple - do my outdoor rides in the morning - but I am still curious why this might be happening.