Sleep

Laufs H, Walker MC, Lund TE.
‘Brain activation and hypothalamic functional connectivity during human non-rapid eye movement sleep: an EEG/fMRI study’—its limitations and an alternative approach.
Brain. 2007 Jul;130(Pt 7):e75; author reply e76. No abstract available. Erratum in: Brain. 2007 Sep;130(Pt 9):2475.
A case study on sleep spindles, K-complexes and slow oscillations during spontaneous human sleep. There is more comprehensive work by Schabus et al. (sleep spindles) and by Dang-Vu et al. (slow wave activity during sleep) from the Maquet group published 2008 in PNAS.