Apex domains cannot have CNAME records.
Question and response
Question
dig bestsleepaids.org. NS
Answer
bestsleepaids.org. 5 NS ns-968.awsdns-57.net.
bestsleepaids.org. 5 NS ns-525.awsdns-01.net.
bestsleepaids.org. 5 NS ns-249.awsdns-31.com.
bestsleepaids.org. 5 NS ns-645.awsdns-16.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0