I would say they are about equal in strength, maybe the Ambien is a little stronger. While Sonata (zaleplon) may be best indicated for the delayed onset of sleep, Ambien (zolpidem) may be better indicated for maintaining a complete night's sleep. However, many people complain about Ambien only sleeping about 4 hours. Of the two, zaleplon has the shortest half-life, so it may be best when the main problem is getting to sleep, or when you don’t want to sleep for more than four or five hours (for example, on a cross-country airplane trip). Hope this helped
As I often recommend, this best and safest answer to a question like this would come from the prescribing physician, as everyone responds differently to meds, and switching and matching without the Doc's knowledge of the meds and most importantly his/her knowledge of you, could result in avoidable difficulty. Please consult the Doc involved. Hope this helps.
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