I agree with two beards...don't get too close to a bedding area unless you can be positive you are not being heard or seen.
Getting too close to their bedding areas in invading their secure zones and that is when they either sit tight until well after dark or find safer areas.
I have seen deer move their bedding areas during the season but this is also because we have such significant changes in weather with huge dumps of snow and bone-chilling temperatures.