I train for cycling TTs, ranging from 10 mile sprints to 12 hr endurance races. I train on Heart rate and power meters, so I know accurately when I've upped my endurance/fitness. I find if I have a training session, whether that be Turbo or out on the road and I've exceeded a burn of 3000 cals then that following night (without fail) I will suffer with drenching night sweats, to the point I Have to to have a bath towel under the sheet to aid in not ruining my mattress. I've had blood tests to check for anything sinister and all came back clear, It's the increase in training that causes my drenching night sweats. The second night the night sweats seem to be halved, then the following night is usually all clear until I push my training regime once again. Hope this helps.

I train for cycling time trials, ranging from 10 mile sprints to 12 hr endurance races. I train on Heart rate and power meters, so I know accurately when I've upped my endurance/fitness. I find if I have a training session, whether that be Turbo or out on the road and I've exceeded a burn of 3000 cals then that following night (without fail) I will suffer with drenching night sweats, to the point I Have to to have a bath towel under the sheet to aid in not ruining my mattress. 

I've had blood tests to check for anything sinister and all came back clear, It's the increase in training that causes my drenching night sweats. The second night the night sweats seem to be halved, then the following night is usually all clear until I push my training regime once again. Hope this helps.