welcome to HCM.
avoid drinking water at least two hours before going to sleep. Day time it is a good habit to drink plenty of water as it is essential for the proper working of our body system. If you reside in a high altitude location or in a place where it is generally very cold, then your water requirement will be drastically reduced. In such situations frequent urination
is quite normal if you take more water.
Just to be on safer side you should consult a doctor and rule out Juvenile Diabetes
or diabetes insipidus
and get an ultrasound
scan done to exclude posterior urethral valve
or partial retention of urine.
Wish you all the best.