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2. The 12 Most Comfortable Sleeper Sofas for Overnight Guests - AOL

   www.aol.com/12-most-comfortable-sleeper-sofas...

   Sleeper sofas conveniently convert to function as a couch by day and a bed by night. Here are 12 of the best sleeper sofas, recommended by shoppers.

3. Experts Say There Is in Fact a ‘Best’ Temperature for Sleep

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   The ideal temperature for sleep is typically between 60°F and 67°F for most adults, says Martina Vendrame, M.D., neurologist and sleep medicine specialist at Lehigh Valley Health Network.

4. Distance-regular graph - Wikipedia

   en.wikipedia.org/wiki/Distance-regular_graph

   In the mathematical field of graph theory, a distance-regular graph is a regular graph such that for any two vertices v and w, the number of vertices at distance j from v and at distance k from w depends only upon j, k, and the distance between v and w. Some authors exclude the complete graphs and disconnected graphs from this definition.

5. Distance (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Distance_(graph_theory)

   A metric space defined over a set of points in terms of distances in a graph defined over the set is called a graph metric. The vertex set (of an undirected graph) and the distance function form a metric space, if and only if the graph is connected. The eccentricity ϵ(v) of a vertex v is the greatest distance between v and any other vertex; in ...

6. Experts Reveal the Exact Time to Shower for Better Sleep - AOL

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   Revamp your sleep space. Create a cave-like environment to obtain optimal sleep. Sleep experts recommend a cool temperature of about 65*F, pitch darkness (blackout curtains can help), and a sound ...

7. List of conversion factors - Wikipedia

   en.wikipedia.org/wiki/List_of_conversion_factors

   ≡ Time of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at 0 K [8] (but other seconds are sometimes used in astronomy). Also that time it takes for light to travel a distance of 299 792 458 metres. (SI base unit) shake: ≡ 10 −8 s = 10 ns ...