Tranquil Dawn vs Sleepy Blue
Where Tranquil Dawn belongs to Dulux's range, Sleepy Blue is a Sherwin-Williams color. Tranquil Dawn reads as green-grey, while Sleepy Blue reads as blue — two distinct hue families, not close cousins. Sleepy Blue (LRV 58) reflects noticeably more light than Tranquil Dawn (LRV 55), a difference of 3 points that becomes especially apparent in rooms with limited natural light. Tranquil Dawn runs neutral while Sleepy Blue is decidedly cool, which means they'll respond very differently to warm vs cool light sources. The ΔE 8.0 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Tranquil Dawn vs Sleepy Blue in Real Spaces
2 real rooms side by side. Tranquil Dawn and Sleepy Blue are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Sleepy Blue brings more warmth to the space, while Tranquil Dawn keeps things cooler and crisper.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. Sleepy Blue brings more warmth to the space, while Tranquil Dawn keeps things cooler and crisper.
Color Details
Tranquil Dawn vs Sleepy Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Tranquil Dawn on one side and Sleepy Blue on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Tranquil Dawn comparisons
See how Tranquil Dawn stacks up against other well-photographed colors across different brands and tones.
