Abstract: A protein fragment for inducing sleep in mammals comprising a fragment of interleukin-1 .beta. from about amino acid 208 to about amino acid 240 and its physiologically active derivatives. The fragment comprises the amino acids sequence: ##STR1## The protein fragment may be derived by synthetic methods and a cysteine residue may be attached to the last threonine residue.

Abstract: A device is described for concentrating solar radiation upon the surface of a helicoidal tube assembly containing a circulating heat transfer medium whereby the energy of said radiation may be collected and utilized. The device consists of a rectangular container wherein is supported a longitudinal plurality of aligned curved reflectors for gathering and concentrating incident solar radiation, multiple vertical reflectors to gather low-angle radiation, a convex radiation concentrating reflector beneath said helicoidal tube and a means for damping excess solar radiation. A method is given for the utilization of said solar radiation collector whereby the heated circulating medium provides the means for heating and cooling buildings.