To find the median of a set of numbers, you first need to arrange the numbers in order. The hours Christina slept are already in increasing order:
0, 2, 4, 6, 8, 10
Since there are 6 numbers (an even count), the median will be the average of the two middle numbers. The middle numbers in this case are the 3rd and 4th numbers:
3rd number: 4
4th number: 6
Now, to find the median:
\[ \text{Median} = \frac{4 + 6}{2} = \frac{10}{2} = 5 \]
Therefore, Christina's median number of hours slept is 5 hours.