My Husband Just Started Lisinopril 10 Mg Once A Day

My husband just started lisinopril 10 mg once a day yesterday was off work and it made him sleepy. He took it this morning and he was sleepy again. He is only to take it once daily. Can he take it tonight instead of in the morning and the start taking it at night. It is his diastolic that is high. Low 90s to 100. Systolic a are always normal. He has to work t morrow and doesn't want to take it in the morning but doesn't want t miss a dose because it seemed to help a little