The nuclear envelope is a membrane system which surrounds the nucleoplasm of eukaryotic cells. It is composed of the nuclear lamina, nuclear pore complexes and two nuclear membranes. The space between the two membranes is called the nuclear intermembrane space.
Plays a role in promoting sleep by enhancing metabotropic transmission of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) in GABAergic neurons upstream of a wake-inducing dopaminergic pathway. {Experimental EvidencePubMed:28900300}.