There are several theories but the two that seem to stick are that sleep: allows your body to replenish energy stores and repair itself. gives you the chance to save energy. Sleep may also aid learning and give our bodies time to organise all the memories of the hundreds of events we experience every day.
Softwood is also used in the production of paper, and for various types of board such as MDF (medium-density fiberboard). The finer softwoods have many special uses. they are used for making window frames,doors,frames,t.v. stands,flooring and beds.
The distinction between hardwood and softwood is botanical, rather than referring to the strength or hardness of the wood. Hardwoods are relatively broad-leafed trees with seeds that are produced in an enclosed form, such as a fruit or nut; softwoods are coniferous or cone bearing trees with needle-like leaves.