Final answer:
It is unclear how this question relates to a specific academic subject, but it may fall under the subject of Health if the focus is on how someone can die in their sleep.
Step-by-step explanation:
This question seems to be about someone who passed away in their sleep. While it is important to acknowledge and mourn the loss of a loved one, it's unclear how this relates to a specific academic subject. However, if you are looking for information on how someone can die in their sleep, this may fall under the subject of Health.