1. To describe the 24-hour circadian rhythm of heart rate among patients after stroke in the sub-acute phase during 3 days. 2. To examine the differences in the circadian rhythm of heart rate along 3 days between patients after stroke in the sub-acute phase and control group matched by age and gender. 3. To describe the reaction and examine the differences in reactions of the heart autonomic system during rest, paced breathing and activity in both groups- stoke and control.