Best detangling spray for dds' unruly hair?

[Diege]

Have been battling with this for a few weeks now, and it's adding at least 20 mins onto our morning routine!
All 3 dds have long-ish hair, and wake up in morning with what can only be described as matted clumps of hair, despite it being brushed before bed. Any tips of the best product to use?

Avon do a leave in conditioner which is v cheap, especially when it is on offer.

Thanks so much for all the tips . Am ready to try a few out as this morning was very stressful!