What sleeping pills don't disrupt sleep architecture?

Very good question: I hear all sorts of marketing claims regarding sleep meds and tendency to preserve various phases of sleep, but not really convinced that any do not disrupt patterns. However, your best bet prescription wise might be lunesta, and otc melatonin would also be relatively appropriate. Drugs such as ambien, sonata, (zaleplon) barbiturates and benzodiazepines all disrupt sleep patterns quite substantially.