Quetiapine is an antipsychotic drug to treat severe mental illness, but it makes people feel sleepy, so has also been used as a sleeping pill – by prescription and illicitly.
With so many different types out there, it's hard to know what sleep medications are safe to use. Here's a guide.
Sleeping tablets such as Ambien can have serious side effects.
Before travelling, plan ahead in case you need to pack medicines for sleep, diarrhoea, malaria, pain or anxiety.