This Head of Household competition is called "When The Clock Strikes Twelve" and here's how it works:

In this Endurance competition, beginning at 6pm EST on Sunday, every hour you must send a mail saying the phrase:
*Hits Alarm Clock*

This mail must come to my mails between XX:00:00 and XX:01:00 [including both these numbers] of every hour. XX referring to every hour, for example 6pm EST being 17:00:00 on tengaged mail timestamps.

Every time you successfully do this, you will score a point.

Your first mail can be at 6pm EST on Sunday, and the last mail you can send is 6pm EST Monday, thus meaning the greatest score you can achieve in this challenge is 25.

The houseguest with the most points will become the new Head of Household.

If there is a tie, whoever sent MORE mails between those in a tie sooner [in an hour where all those tied did send], then that player will win.

If that remains a tie, whoever sent their last mail first would win.

If you have any questions, you have almost a day to ask before the competition begins.

Good luck!