While it's physically possible to sleep on a pile of money, it's not a practical or comfortable choice for a few reasons:

Comfort: Money, especially paper currency and coins, is not designed for comfort. Sleeping on a pile of hard, uneven objects can lead to a very uncomfortable night's sleep.

Hygiene: Money is known to be one of the dirtiest items in circulation. Bills and coins can carry a variety of germs and contaminants, so sleeping on them could expose you to potential health risks.

Damage: Sleeping on money can damage the currency, especially if you're using coins or crumpling paper bills. This could result in torn or wrinkled currency that may no longer be accepted as legal tender.

Security: Storing large amounts of money in this manner is not secure. It makes you vulnerable to theft or loss.

Legal Considerations: Destroying or defacing currency is illegal in many countries, and sleeping on money could be seen as a form of defacement if it damages the currency.

Who cares?
I am making money while sleeping.