Your body will tell you how much sleep you need. Learn to listen. I have never been disappointed with a patient knowing when to rest, once she learns to understand her own body. Your kidneys are now working for two - you and your baby. You may want to avoid regular hot and iced teas.
Tea has a natural mild diuretic effect.
A better choice would be herbal teas. Drink plenty of fluids, especially water, to replace what you lose. This allows 'back flow' of the contents of the stomach into the esophagus. The esophagus reacts to the stomach acid with a burning sensation. Antacids may relieve this, but please get your doctor's advice on the one to use.