I would be very hesitant about taking antipsychotics (of which Seroquel, quetiapine is one). There is research suggesting they may cause brain atrophy (reduction in brain volumes over time).
Now, if one is dealing with something really serious like psychosis or acute mania, maybe it is a preventing a short-term harm which outweighs the risk of this long-term harm. But if it is just trouble sleeping, considering this risk, I think one should explore other options first.
(I used to take Seroquel for insomnia and anxiety myself. I stopped when I discovered this research. It also contributed to our decision to get our son off risperidone.)