claim: Levoamphetamine improves the ability to stay conscious and awake.
evidence: Givak-e Sofla -LRB- گيوك سفلي , also Romanized as Givak-e Sofla and Geyuk Sofla ; also known as Givak-e Pa ' in and Givak Pa'in -RRB- is a village in Baqeran Rural District , in the Central District of Birjand County , South Khorasan Province , Iran .. Province. Provinces of Iran. South Khorasan. South Khorasan Province. County. Counties of Iran. Birjand. Birjand County. Central. Central District ( Birjand County ). Rural District. Rural Districts of Iran. Baqeran. Baqeran Rural District. Baqeran Rural District. Baqeran Rural District. Central District. Central District ( Birjand County ). Birjand County. Birjand County. South Khorasan Province. South Khorasan Province. Iran. Iran. At the 2006 census , its population was 28 , in 11 families .