After you've developed the sleepers on the main roof surface when you can get the sleeper miter angles you still need a saw blade bevel angle to miter the two sleepers together. You can use this formula for sleeper #1, Saw Blade Bevel Angle = arcsin(sin main roof slope) x cos(67.5)). For the saw blade bevel angle for the miter at sleepers #2 & #3 use Saw Blade Bevel Angle = arcsin(sin main roof slope) x cos(22.5)). Or you can use the RafterTools+ app on the iPhone. Enter 135° eave angle and use the hip rafter backing angle for the Saw Blade Bevel Angle. Use an eave angle of 45° for the saw blade bevel angle for sleepers #2 & #3.
Use the same saw blade bevel angle to cut the miter on the bottom of the Octagonal Hip Rafters that frame into the sleepers. For the miter angle cut at the hip rafters that frame into the sleeper you could also use Layover Cut Angle = Layover Rafter Slope Angle + arctan (tan Main Roof Slope Angle x sin Layover Rotation Angle in Plan View) ....where the Rotation Angle in Plan View is 67.5° and 22.5°.