DD1 was a shocking sleeper and would NOT sleep in cot. so i bought a hammock during second pregnancy in anticipation of a bad sleeper again. however DD2 (even though is a bit of a cat napper) will actually sleep in her cot. i chose to keep her in cot rather than hammock just so i didnt have to worry about the transition from one to the other. so my advice is save the money but wait until you see what kind of sleeper you get.