Staying up late at night and sleeping during the day is not usually associated with sudden death.
Sudden death usually tends to occur in people with underlying cardiovascular disease, and the probability of sudden death in normal people is very low. At present, this is a sleep phase disorder, you can carry on the positive adjustment of the sleep biological clock, you can continue to regularly delay the sleep time, until the sleep time is adjusted to the night.
In addition, the reverse adjustment of the sleep biological clock can be carried out, and light therapy can be carried out: light in the morning, and sunglasses can be worn at night to avoid light. In addition with insomnia can take melatonin, oxazepam, zopiclone, etc. to promote sleep.
Suffering from sleep problems should be timely consultation, drugs should be used under the guidance of a physician.