Students/professors are suddenly falling asleep with no reason as to why...

1. Why only Hogwarts?

2. How many people will be affected by it?

2.1. At least 5 the first round

2.2. There will most likely be more than one round of the epidemic

3. What does it do?

3.1. No Magical creatures

3.2. Hogsmeade can be included in another outbreak of the epidemic.

3.3. Randomly select 5 students/professors. PM them to let them know that they have been hit with the epidemic. They can have their student pass out at any time, it just has to happen.

4. What is it?

5. Who is causing it?

6. How long does it last?