I will come out and say that I do not agree with the change to the Call of the Sandman heal proc. However, I do also acknowledge that as it stood, it needed a nerf.
Using it in an AoE would sometimes give me 5-6 procs of the heal in things like Psionic Mastery > Mass Hypnosis on Sentinels. I felt this was too strong, and was actually going to bring this up once this patch had gone live. It seems that this nerf is close to the ballpark, but too extreme. It neuters the usefulness of AoE sleeps that have long cooldowns (Munitions Mastery > Sleep Grenade (Blaster), Psionic Mastery > Mass Hypnosis (Sentinel) etc.) too harshly.
The nerf I would suggest is to keep the AoE proc triggering multiple times, but capping the proc at 3 to match the PPM count. I feel this is a good neutral ground to prevent a Blaster from healing half their health bar by standing in a group of mobs and panic pressing a group sleep, while also making the survivability aspect of it worth it for more defense-oriented sets.
As it stands, Sandman heal proc is now far too weak to justify ever using in an AoE only setting (which a few archetypes have) and I'll probably need to reroll my Sentinel/Blaster both to accomodate the nerf. Thanks for all your hard work, I hope you consider this request.