At 60 Alchemy 13 Smithing on Windsday with full moon I went through 8 stacks of materials:
Smithing skill-ups just about every synth til 14 then none.
Alchemy skill-ups were a bit rare, but that's how 60+ is I suppose... got +2.1.
The recipe yields 6 bolt heads as stated above, and when all was said and done I was able to finish with a bit over 4 stacks.
I farmed the materials except for ingots which were cheap at AH so I bought them, and the bolt heads sell (slowly) at 60k each. So having spent roughly 100k on the materials I currently have the results on AH for 240k. Really not a bad deal.
I have a friend with high woodworking who I considered begging to make sleep bolts, however looking at the price of the bolts vs the heads (and knowing almost nothing about woodworking) I didn't think it would yield much more, if any, profit. In retrospect though he does have some woodworking key item for bolts... and sleep bolts sell much faster...
Happy Synthing.