Possible Clues:

• Northern ocean about freezing point - this will induce numbness
• Drug used on arctic voyage
• Drug given name - very cold round object swallowed
• (Drug) inducing numbness
• Bearing cold, accepting ordinary drug
• Hurried back to a bed, I see, for a drug
• Sleep-inducing oils initially detected in Northern ocean
• Crashing the car into, gets caught with the drug
• Pole and its location, around circle, numbing
• Stupor-inducing drug