I too have zero problem falling asleep. My wife complains I say goodnight and before she can even respond I am in deep sleep. But like you, I have always respected my 7 hour sleep window. For years I participated in sport including triathlons which takes a fair deal of commitment if working a full time job.
21h45 off to bed with cup of rooibos tea. read 15 minutes and 22h00 switch off the light... and that is that. Awake at 05h00 and 05h30 on the road...cycle or run or swim.

The downside is I can not begin to count how many movies I have never seen the end of {grin}