Toddler spikes temp when tired

[Superstar96]

This is going to sound mad but anytime my son (21 months) is overly tired he starts to burn up. Not with a full high temp but his temperature starts to climb to 37.5 ish which is on the higher side for him. Has this happened to anyone else’s kid?

I believe I once read that temperatures always tend to be highest around tea time/evening, which I'm assuming is when your little one is the most tired? X

37.5 isn't 'burning up' it's within the 'normal body temp range'.
All people tend to be hotter toward the end of the day / evening. This is more so in children.
37.8 is considered a low grade temp and 38 & over is a fever.
I'd not be concerned at all, although you could remove a layer of clothing for the evening or run a bath at 35/36 degrees and let him splash / cool off before bed.
Use light & 100% cotton layers for bed.

Thanks for advice 👍🏼 he woke up at 2am with a temp of 38.3 & vomiting everywhere so he did infact have something working on him. Hopefully it eases soon