One man's poison.
In an unrandomised uncontrolled study on boats and trains, capsules of flurazepam (30 mg) and temazepam (20 mg), when chewed, but not when swallowed whole (even with the ends pricked), gave a better night's sleep than 'Mandrax' (methaqualone 250 mg/diphenhydramine 50 mg) and a better night's sleep than nitrazepam 7.5 mg.
D002214:Capsules; D002986:Clinical Trials as Topic; D004155:Diphenhydramine / Q000008:administration & dosage; D004338:Drug Combinations; D004341:Drug Evaluation; D005479:Flurazepam / Q000008:administration & dosage; D006801:Humans; D008702:Methaqualone / Q000008:administration & dosage; D009567:Nitrazepam / Q000008:administration & dosage; D012890:Sleep / Q000187:drug effects*; D013693:Temazepam / Q000008:administration & dosage; D014195:Travel
D002214:Capsules; D004338:Drug Combinations; D008702:Methaqualone; D004155:Diphenhydramine; D009567:Nitrazepam; D013693:Temazepam; D005479:Flurazepam