Possible Clues:

• Like some sedatives
• Illegal drug
• Hurried back to bed with iodine for cold, as it might put one to sleep
• Anaesthetic with nitrogen and oxygen kept in cold
• Drug to induce drowsiness or stupor
• Ran back to bed I see with sleeping pill
• Drug puts spark into fizzy tonic
• Drug producing numbness and torpor
• Stunning little number?
• The dope ran around the company with the jerk