When we talk to phone to make our bed time is 5 hours, and may be reduced to less than 1 hour, when we sleep late at night will make us wake up late to school thinking.
When we talk on the phone, it will make us less time sleeping five hours and may be less than that if more than one hour when we sleep, we will wake up late to school.
When we talked on the phone a lot will make our bedtime will be less 5 hours. And may be less than that, if more than 1 hours. When we sleep late will make us late to school late.