Is Seroquel a sleeping aid?

No, Seroquel is not a sleep aid. However, some people who take it report that it makes them sleep soundly.

Answer

No, it's not actually licensed to prescribe for a sleep aid. It is proven to be more sedating in low dose though. For most, not all it's 200mg and lower.
-I was specifically prescribed seroquel for use as a sleeping aid. Whether or not the FDA labels it as such I am not certain. This is common practice amongst medical professionals.

Answer

Although Seroquel® (quetiapine fumarate) is not FDA-approved for sleep disorders or anxiety, many physicians prescribe low doses of the drug, off-label, to treat those conditions. Clinical studies and empirical data indicate Seroquel® is an effective, non-addictive alternative to medications specifically formulated for insomnia.

Seroquel® may be used longterm for chronic insomnia in some people.

Be aware that it is perfectly legal and legitimate for a doctor to prescribe medication for use in disorders other than those indicated by the FDA.