Study Deep sleep

Table.1 Contingency table.

Deep sleep's SUM
Year	Month	Day	Night
2021	1
	2
	3	164	432
	4
	5
	6
	7
	8
	9
	10
	11
	12
2021's SUM		164	432
2022	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	11
	12
2022's SUM
2023	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	11
	12
2023's SUM
SUM		164	432