It is very much possible for you to wake up one day and feel tired and weary. Sometimes, the body just is not in support of you going to work. In such a situation, it is just better to listen to your body and take a day off to give yourself some rest. Here is a Sick Leave mail to manager for one day.
Sick Leave Request Mail to Manager/ Boss for One Day
Subject: Request for sick leave
I had exerted myself by overworking the day before last. We had stayed in the office till late working on the case. Due to insufficient sleep, I woke up to a sever headache today. I request you to grant me a day’s leave from the office as I need to rest.
I will be grateful to you in this regard.