This boulder sits under the Fer Irie boulder. If you walk to Fer Benson (on the lake side of Fer Irie) and walk towards the lake you will encounter a large chasm. Dream Snatcher is in this chasm. Jump across or climb around on a side and crawl down the slot to the start. There is also a high start that begins midway through the rail and goes at around V5.
problem starts at 02:44
problem starts at 02:50