Islamic Interpretation of Dreams (Ibn-i Sirin):
(Sandglass) In a dream, the two bulbs of a sandglass represent two sons, or two brothers, or two partners. Whatever happens to them in the dream will reflect in such people.
An hourglass in a dream also means makeup, beauty, or marriage.
The sand trickling from the upper bulb into the lower bulb in a dream represents manâs semen.