Get your flu shot and yearly check-up. Self explanatory! No one likes sniffling and aching and sneezing and coughing getting in the way of life. Yuck.
Boost your immune system. You can do this by drinking plenty of water, washing your hands often to prevent sickness, and eating nutritious foods.
Get yourself ready for Daylight Savings Time. Go to bed earlier when you can, especially the week before the clocks change. Longer periods of darkness = longer periods of sleep!