Even though you're saying your sinuses are clear, they could be a little swollen. Buy a good anti-swelling agent--you can find them at the local drug store. Then sleep with a dehumidifier tonight.
If this doesn't help, go to your doctor. You could have pinched something without even knowing it, so even though you "can" smell, your brain won't register it. Deffinately bring this up, though, because losing your sense of smell totally without being sick is very rare and can point to serious health problems.
The loss of smell could be due to a sinus infection, a cold or a chronic allergy. It could also be due to neurological causes. Sinus infection causes blockage of flow especially when a person lies down. The blockade is affected by the side to which the person turns also. You will need to consult your primary care physician for proper assessment. In the meantime practice good breathing exercises, humidify your room and do steam inhalations.
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