Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The hourglass in a dream indicates counting one's life and days. The running out of its sand indicates the approach of death.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The hourglass indicates travel or waiting for something. It indicates a man who calculates matters.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The hourglass is interpreted as worry. Whoever sees himself looking at it is in worry and anticipation.