For normal healthy individuals, it's ok to take a bath even late into the night. But make sure that u dry your hair before u sleep bcos GERMS like moisture. They need moisture to thrive!

We don't want to have germs all over our pillows and hair, right?! What if the germs get into our eyes and we may get an eye infection overnight.

For those of u who get a cold easily once the weather turns cooler, it is advisable NOT to do so bcos your immune system just isn't strong enough to withstand the rapid change in temperature.