I am not learned enough, but have used internet resources to study Visnu Sooktams. The quotation is 1.022.21, and reads: तद्विप्रासो विपन्यवो जागृवांसः समिन्धते |विष्णोर्यत्परमं पदम् || My word by word translation reads: Thus sages exist ! (तद्-विप्र-अस्-ओ = तद्विप्रासो) joyfully/praise reverentially! (विपन्य-वः = विपन्यवो) awake overnight (जागृवांसः) together with the Supreme Being (सम्-इन्ध = समिन्धते); It differs from Sri Sriram in इन्ध which can also mean Supreme Being. विपनया means joyfully and विपन्यु means praise. There are three visnu Sooktams in rigveda: 1.154, 1.155, 1.156, although 155 also has reference to Indra. All three are due to rishi Dirghatamah Auchitya. I hope that this information helps.
