Ibn Sīnā’sIbn Sīnā (Avicenna)Ibn Sīnā (Avicenna) conception of dreams is scattered over parts of different works, both philosophical and medical. In the former, he tries as much as possible to explain the experience of dreams on the basis of the functioning of the inner senses, especially the imaginary faculty, during sleep. This appears to be in line with AristotleAristotle. Contrary to AristotleAristotle, however, Ibn SīnāIbn Sīnā (Avicenna)Ibn Sīnā (Avicenna) affirms the possibility of supernal, divinely inspired influences—more particularly, influences related to the celestial soulsSouls, celestial, sometimes called “angels.Angels” Where AristotleAristotle saw no real possibility of offering a causal explanation for prophecy in dreams, Ibn Sīnā is convinced he can offer one, by positing a congenerityCongenerity between the celestial soulsSouls, celestial and our souls. On the medical side, however, he avoids any reference to experience based on divine intervention, limiting his comments instead to empirically observable facts. This complex approach to the experience of dreams can only be understood in the religious and scientific context of Ibn Sīnā’s Ibn Sīnā (Avicenna)Ibn Sīnā (Avicenna)time.