PERIODIC MOVEMENT DISORDER, SLEEP
\pˌi͡əɹɪˈɒdɪk mˈuːvmənt dɪsˈɔːdə], \pˌiəɹɪˈɒdɪk mˈuːvmənt dɪsˈɔːdə], \p_ˌiə_ɹ_ɪ__ˈɒ_d_ɪ_k m_ˈuː_v_m_ə_n_t d_ɪ_s_ˈɔː_d_ə]\
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Excessive periodic leg movements during sleep that cause micro-arousals and interfere with the maintenance of sleep. This condition induces a state of relative sleep deprivation which manifests as excessive daytime hypersomnolence. The movements are characterized by repetitive contractions of the tibialis anterior muscle, extension of the toe, and intermittent flexion of the hip, knee and ankle. (Adams et al., Principles of Neurology, 6th ed, p387)
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