Store Availability Of Practitioner (day Of Week And Time Of Day) In SQL Server?

I am developing an application which will keep track of various information about medical practitioners that are affiliated with my place of work. One thing that we are tracking, is their availability by time of day (morning, afternoon, and evening) for each day of the week (monday - sunday). Additionally we will store an optional comment about the practitioners availability, something like "Does not work during full moon."

The input/display form for this information will be table with days of the week as column headers, and times of the day as row headers. Check boxes will indicate whether the practitioner is available during the specified time.

I am having a hard time figuring out how to store this information in the database. The most obvious solution to create a table with 24 columns (21 for 7 days * 3 times, 1 as the primary key, and 1 for the foreign key referring to the practitioner, and 1 for the comment). Which is a crappy table, but at least it's easy to select and update.[code]....