At 46 I used to be well and good with just 4h sleep. Four months ago I started a new job at a nearby university campus and there are secure bike lanes the whol

At 46 I used to be well and good with just 4h sleep. Four months ago I started a new job at a nearby university campus and there are secure bike lanes the whole 7 miles from my home to the office. In the middle of the traject there is a park with outdoor fitness equipment where I make a stop and do some pull-ups and push-ups. Since I started biking to the work I have a lower level of energy unless I rest for at least 7-8 hours. I don't know if is the age kicking in or if it is the less sedentary lifestyle. The change in the sleep pattern combined with my 4yo autistic kid demanding my full attention at home (he was diagnosed early and is doing very well) diminished my availability for side projects.