In-depth Comparison (2024): Sleepgram Adjustable Pillow vs. Wondersleep Pillow

Polyester Fiber (Down Alternative)

The Sleepgram Adjustable Pillow is an extra soft polyester fiber pillow with a thick starting loft. Though nominally adjustable based on the pillow-in-pillow design that allows the sleeper to keep or remove two layers of inner pillows, I wouldn't consider the Sleepgram pillow fully adjustable because of the softness, which limits its appeal for those who want more support, and the inability to do micro-adjustments. The Sleepgram pillow can be a good option for stomach-sleepers, but I would not recommend it for side-sleepers and back-sleepers.

The Sleepgram pillow uses a pillow-in-pillow design similar to the Casper pillow. In fact, when I first unboxed the pillows, I thought they were the same pillow with different logos. However, on a closer look, I found three main differences. The first difference is the softness of the pillows. Both pillows have the same starting loft, but my head sinks in more when I sleep on the Sleepgram pillow compared to the Casper pillow. The Casper pillow is already so soft that my head sinks significantly, so I was surprised that the Sleepgram pillow had even less support. Even though the Sleepgram pillow starts at 10 inches of loft by my measurements, my head sinks so far into the pillow that I feel even less support than I get from pillows that start at half that loft. I would guess the difference between the Casper and Sleepgram softness comes from the friction in the polyester fibers. The Sleepgram polyester fibers glide very smoothly against each other, almost like silk strands. This means that the material appears to move to the side when I lay my head on the pillow. The Casper polyester fibers are also soft in terms of firmness, but they aren't as soft in terms of friction. Because of the softness of the Sleepgram pillow, I'm unable to get the support I need for side-sleeping, and this is one of the reasons I wouldn't consider the Sleepgram pillow fully adjustable.

The second difference is the number of inner pillows. The Sleepgram pillow has two inner pillows while the Casper pillow only has one. Nevertheless, the total starting loft is the same across the Sleepgram and Casper pillows as far as I can measure, so the Sleepgram inner pillows are individually thinner than the Casper inner pillow. I find this to be an advantage for the Sleepgram pillow because it does allow for more configuration options. Sleepgram labels one inner pillow with a blue tag and the other with a red tag. The instruction booklet that comes with the pillow says that the inner pillow with the blue tag is softer than the one with the red tag, so you can get different firmness levels by keeping different configurations of the two inner pillows. Because I can't get the support I need for side-sleeping on the Sleepgram pillow even with both inner pillows loaded inside, I tend to prefer stomach-sleeping when I use it. For stomach-sleeping, I'll remove the inner pillow with the blue tag. Though I appreciate the configuration options, I still prefer the ability to micro-adjust with the Saybrook and Coop pillows.

Finally, the zipper on the Casper pillow that I purchased feels significantly easier to operate for me compared to the zipper on the Sleepgram pillow that I purchased. This contributes to my overall perception that the Casper pillow has higher quality construction.

For stomach-sleepers who might want to try out different loft levels on the softer end of the spectrum, the Sleepgram pillow can be a good option. For side-sleepers, I'd recommend other options.

Shredded Memory Foam and Polyfiber Mix

On paper, the Wondersleep Premium Adjustable Pillow should be similar to the Saybrook and Coop pillows: it has shredded memory foam and polyester filling. However, that's where the similarities end. I selected this candidate because it was much cheaper than the other pillows while sporting the same reported features. I wanted to see what the difference was in person. Unfortunately, the pillow case quality, the adjustability, and the filling comfort level don't match up in my opinion.

Immediately upon unpacking, I notice the pillow has much less filling compared to other pillows and is very thin. The thinness of the pillow defeats the purpose of the adjustability because it won't be in the loft range many people need. The loft might be okay for stomach sleepers who appreciate a thinner pillow. Though the initial loft measures at 6 inches, the pillow compresses a third of the way down for me when I lie down due to the softness.

The sensation of the Wondersleep pillow fill is dominated by polyester fiber for me, with pieces of shredded memory foam buried throughout. The memory foam feels stiff, not just firm, as if it had been left out in the sun too long. The pillow reminds me of clumps of cattail fluff in the wild: mostly soft and fluffy but with random bits of hard seeds (or in this case, memory foam) inside.

Though many shredded memory foam pillows under $50 can look similar to the Saybrook and Coop pillows on paper, I recommend investing more to get the higher quality construction and better filling found in the top picks.