Hi Padma
Sometimes when a woman commences the menopause she can experience hot flushes during the day and cold sweats during the night. This as others have mentioned is because her hormone levels are in a state of flux as they are in decline.
I read another of your topics on here and you mention your E levels were a bit too low on oral meds and you have been switched to gel. You may find as your E level rises, these sweats may start to reduce. Just a guess, but i hope they dont trouble you for too long.
Hormones do affect us at night too. When I first started hormones I had the most psychotic nightmares. I lashed out in my sleep smashing a glass on my bed side table. When my dose was increased the same happened again (no smashed glass this time) and lasted on and off for a couple of weeks. I am also much colder than i used to be. My hands and feet are like blocks of ice and at night I literally freeze until the bed and I warm up. The joys of becoming a woman.

I would rather these symptoms than being a guy any day!