I think that if the programmed proccess of getting up rises your stress level too much, then it doesn't.
But there's no point in trying to distinguish that. Ideally you could make a chart of your sleep pattern, each day you mark bedtime, wake up time, and then it's good to stick to that with only gradual shifts. I mean that one doesn' t go to sleep an hour later, because that's likely to disrupt the rhythm and make it harder to free run your sleep. Most people are used to the 24 hour rhythm so by having the chart and knowing your bedtime hour you can filter out the disruptions caused by hightech lifestyle