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In addition, lullabies are often used for the developing of communication skills, indication of emotional intent, maintenance of infants' undivided attention, modulation of infants' arousal, and regulation of behavior.  Perhaps one of the most important uses of lullabies is as a sleep aid for infants.[2] As a result, the music is often simple and repetitive.  Lullabies tend to share exaggerated melodic tendencies, including simple pitch contours, large pitch ranges, and generally higher pitch.  It was found that adults of various cultural backgrounds could recognize and identify lullabies without knowing the cultural context of the song.  Lullabies written by established classical composers are often given the form-name berceuse, which is French for lullaby, or cradle song.  One study found lullabies to be the most successful type of music or sound for relieving stress and improving the overall psychological health of pregnant women.  Infants have shown a strong preference for unaccompanied lullabies over accompanied lullabies.  Lullabies are usually in triple meter or 6/8 time, giving them a "characteristic swinging or rocking motion." [8] This mimics the movement a baby experiences in the womb as a mother moves.  In addition to pitch tendencies, lullabies share several structural similarities.  A lullaby or cradle-song, also spelled cradle song, is a soothing song or piece of music, usually played or sung to children or adults.  To reflect this, most lullabies contain primarily consonant intervals.  Tonally, most lullabies are simple, often merely alternating tonic and dominant harmonies.  The tempos of lullabies tend to be generally slow, and the utterances are short.  Lullabies can be found in many countries, and have existed since ancient times.  In addition, infants' preference for rhythm shares a strong connection with what they hear when they are bounced, and even their own body movements.  Furthermore, if there is a sequence of dissonant intervals in a song, an infant will usually lose interest and it becomes very difficult to regain its attention.  This dilutes the rate of material and appeals to infants' slower capacity for processing music.  Lullabies are often used for their soothing nature, even for non-infants.  The purposes of lullabies vary.  Lullabies almost never have instrumental accompaniments.  When there is harmony, infants almost always prefer consonant intervals over dissonant intervals.  While there has been no confirmation, there are many strong arguments that Brahms suffered from a sleep disorder known as sleep apnea.  Again, this appeals to infants' more limited ability to process information.  Again, this aids in the infant's processing of the song.  The most famous lullaby is the one by Johannes Brahms ("Wiegenlied", 1868).  The most frequent tendencies are intermittent repetitions and long pauses between sections.  In some societies they are used to pass down cultural knowledge or tradition.  These characteristics tend to be consistent across cultures.  These clarify and convey heightened emotions, usually of love or affection.  Rhythmically, there are shared patterns.