Night sweats after training & increased calories

Sure, sleep is the best time for recovery and repair, if fed enough body has something to actually do it - and doing it produces heat.
It's really annoying when the arms are still cold for instance, but legs are burning up, since most muscle to repair is there.

Different effect for finally eating more to be at a reasonable deficit.
Too much deficit and body will adapt and is willing to slow some functions down like producing heat for no reason other than to stay warm, so it has enough calories for what is really needed.

I've had the same thing from time to time, particularly when I've worked had on the big muscles in my legs. If memory serves, resistance training can help boost metabolism for up to 36 hours. Also, almost any kind of hard workout causes micro-tears in the muscles involved. Your body will generate plenty of heat in the process of repairing itself.

Thanks for the comments, I'm seeing it as a positive thing as it shows my body is shifting up a gear and hopefully getting on with recovering!!

mmmm...not always. Night sweats can happen for other reasons, so an appointment with your doctor would be wise. You're too young for menopause, but thyroid, hormonal imbalances, and other diseases can cause night sweats.

Yeah, it's because you're producing more thyroid hormone. After a few weeks the body adjusts. I've had this happen, too, every time I've increased calories. I've also sometimes had heart palpitations, nervousness, and increased warmth from consistently eating more for a few days or a week or two. It's just something you have to go through, unfortunately. You might also find you don't sleep as well or feel like you need less. I know it can be disconcerting. But it subsides over time. Your body is adapting to your diet and training. Give it a chance...and don't panic. It will re-equilibrate. In the meantime, try meditation...it works.