@Bow not really explored what it's related to in the medical sense but if I'm to take a guess, yeah seems most likely culprit. Friday night I literally got cursed by time-blindness cos I was hyperfocused on cleaning (and when I get cleaning energy? OH it's so rare! So I try to utilise it as much as possible ahaha) - I didn't realise until the sun was poking its head out.
Plus, my other biggest issue seems to be that once something wakes me up in the morning, it's next to impossible for me to doze off again.
Then when your next door neighbour decides that 7am is a reasonable time to start mowing his lawn first thing Saturday morning, it's kinda game over for any chance of sleep in lol
Decision fatigue is totally a thing hey!! Especially with like, so much emotional turbulence involved in some of the decisions hey! And then adding in decisions that have big/far-reaching impacts like choosing a new home, and I am not surprised that you are at capacity!
Maybe you could ask your mum to like, just place ALL the things she's unsure about into a pile, and then when you have the headspace you can come back to it, rather than feeling like she's having to pester you with it kinda thing?
Also an important thing to remind yourself of (especially if you're like me, and struggle sometimes to prioritise) is to ask yourself "Do I need to make this decision RIGHT NOW? What are the consequences of not choosing or delaying?"
Then you can reserve your exectutive function energy for choices like 'school districts and access to medical care in a new neighbourhood' vs. ending up in frazzle-town cos you absolutely HAD to make a choice on 'do we want to keep this old box of miscellaneous assorted fabrics and newspaper clippings or do we throw it away' ya know?